"Apple has brought its unique brand of richness and simplicity to servers. OS X Leopard Server is the fifth generation of the software half of Apple's server platform. This time around, Apple took what is a unique and bold approach for a Unix server. Leopard Server continues the OS X Server tradition of delivering platform-independent file/print, e-mail, Web, and network edge services (such as stateful firewall, VPN, proxy, virus, and spam filtering). But it is as easy to set up and run as a desktop. Truly; the typical Mac user could get a Leopard Server going, because the default administrative interface is a match for a Mac's System Preferences."

As noted by a previous posts. Mac OS X does scale very well. Maybe not from the GUI but it is BSD UNIX under the hood and I don't think anyone will tell you that BSD UNIX doesn't scale well.

Harder to do than Windows? Only people I know that have only ever used Windows Server will say something like that. Or people that have used very old versions of other NOSs.

PS: Installing a NOS on a home computer and hooking up less than 200 computers to it doesn't even begin to make you an expert. Step two would be having people and all their ingenious ways of doing things differently from each other and supporting them would start to make you an expert.

Mac OS X is not BSD Unix. It is a BSD layer built on top of a Mach core with some BSD tools in the userland. They've done some things to improve their kernel scalability, but it's fundamentally a workstation OS right now. I think they've been improving it steadily, though they're nowhere close to FreeBSD, Linux, or Windows as a server OS.

As noted by a previous posts. Mac OS X does scale very well. Maybe not from the GUI but it is BSD UNIX under the hood and I don't think anyone will tell you that BSD UNIX doesn't scale well.

Darwin's based on FreeBSD, and the FreeBSD team thought and admitted that it doesn't scale well, giant locks were everywhere in the kernel. They've started the SMPng initiative years ago to fix this. Apple snatched the FreeBSD 4.x codebase, which didn't get much SMPng treatment at all.